I got a E71 courtesy of WOM, the first thing I checked was call quality, the speakerphone is on the relatively loud side, the headset volume is ok, not as great as the N95-3 that I have which maybe due to it having US 3G.
Also for a person with fat fingers, although the keys are relatively small, I can rarely make mistakes, and I can precisely hit what I want, big upgrade from the E61i
As I handle it more, I'll post more on my blog. So far it's turning out to be an awesome device.